Python中如果判断一个文件是不是jpg的图片？ 第1页

       def detect_picture(file):     """     检测图片的类型     :param file: 路径     :return:      """     # 读取前 32 个字节     data = open(file, "rb").read(32)      if data[6:10] in (b'JFIF', b'Exif'):         return 'jpeg'      elif data.startswith(b'211PNG
32
'):         return 'png'      elif data[:6] in (b'GIF87a', b'GIF89a'):         return 'gif'      elif data[:2] in (b'MM', b'II'):         return 'tiff'      elif data.startswith(b'01332'):         return 'rgb'      elif len(data) >= 3 and data[0] == ord(b'P') and data[1] in b'14' and data[2] in b' 	

':         return 'pbm'      elif len(data) >= 3 and data[0] == ord(b'P') and data[1] in b'25' and data[2] in b' 	

':         return 'pgm'      elif len(data) >= 3 and data[0] == ord(b'P') and data[1] in b'36' and data[2] in b' 	

':         return 'ppm'      elif data.startswith(b'x59xA6x6Ax95'):         return 'rast'      elif data.startswith(b'#define '):         return 'xbm'      elif data.startswith(b'BM'):         return 'bmp'      elif data.startswith(b'RIFF') and data[8:12] == b'WEBP':         return 'webp'      elif data.startswith(b'x76x2fx31x01'):         return 'exr'      else:         return None